Kaine Horman Thinks Stepmom Is Involved with Kyron's Disappearance

Kaine Horman says he believes his estranged wife "is involved in the disappearance" of his 7-year-old son, according to his petition for a restraining order against Terri Moulton Horman.

In the petition, which was unsealed Thursday by a Multnomah County judge, Kyron Horman's father writes that he "also recently learned that respondent [Terri Horman] attempted to hire someone to murder me. The police have provided me with probable cause to believe the above two statements to be true."

Kaine filed for a restraining order and divorce on June 28, two days after he moved out of their home with the couple's 19-month-old daughter Kiara. Father and daughter have been living in an undisclosed location while Terri has remained secluded inside her home outside of Portland, Ore.

The restraining order requires the former elementary school teacher to stay more than 500 feet from her husband or daughter and to not go near Skyline Elementary – where Kyron was last seen June 4 – Kaine's workplace or his gym, reports The Oregonian. She is also not allowed to enter her daughter's current or future day care or school.

Terri was also ordered not to possess any firearms. Kaine, in his petition, said he did not know if his wife had access to firearms but said he was concerned she possibly could since she "attempted to hire someone to murder me."

Terri, who has not been named a suspect or person of interest in the case, has reportedly denied the claims made by a landscaper that she was involved in the alleged murder-for-hire plot against her husband.

Since leaving Kyron's stepmother, Kaine and the second grader's mother, Desiree Young, have repeatedly asked Terri to reveal any information she may have about the boy's disappearance.

"We continue to issue our plea of her fully cooperating with law enforcement and the investigation to help bring Kyron home as quickly as possible," Young told reporters on Monday.